/*txt 弹出内容
func 点击确定按钮调的方法
sub 确定按钮重命名
width 宽
height 高*/
window.alert = function(txt,func,sub,width,height)  
	   {  
	var w = '50%';
	var h = '150px';
	var s = '确定';
	if(width!='' && width!=null){
		w = width;
	}
	if(height!='' && height!=null){
		h = height;
	}
	if(sub!='' && sub!=null){
		s = sub;
	}
	if(func=='' || func==null){
		func = 'doOk()';
	}
	 var winSize = function(){  
	        var xScroll, yScroll, windowWidth, windowHeight, pageWidth, pageHeight;  
	        // innerHeight获取的是可视窗口的高度，IE不支持此属性  
	        if (window.innerHeight && window.scrollMaxY) {  
	            xScroll = document.body.scrollWidth;  
	            yScroll = window.innerHeight + window.scrollMaxY;  
	        } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac  
	            xScroll = document.body.scrollWidth;  
	            yScroll = document.body.scrollHeight;  
	        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari  
	            xScroll = document.body.offsetWidth;  
	            yScroll = document.body.offsetHeight;  
	        }  
	  
	        if (self.innerHeight) {    // all except Explorer  
	            windowWidth = self.innerWidth;  
	            windowHeight = self.innerHeight;  
	        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode  
	            windowWidth = document.documentElement.clientWidth;  
	            windowHeight = document.documentElement.clientHeight;  
	        } else if (document.body) { // other Explorers  
	            windowWidth = document.body.clientWidth;  
	            windowHeight = document.body.clientHeight;  
	        }  
	  
	        // for small pages with total height less then height of the viewport  
	        if (yScroll < windowHeight) {  
	            pageHeight = windowHeight;  
	        } else {  
	            pageHeight = yScroll;  
	        }  
	  
	        // for small pages with total width less then width of the viewport  
	        if (xScroll < windowWidth) {  
	            pageWidth = windowWidth;  
	        } else {  
	            pageWidth = xScroll;  
	        }  
	  
	        return{  
	            'pageWidth':pageWidth,  
	            'pageHeight':pageHeight,  
	            'windowWidth':windowWidth,  
	            'windowHeight':windowHeight  
	        }  
	    }();  
	   
	    var shield = document.createElement("DIV");  
	    shield.id = "shield";  
	    shield.style.position = "absolute";  
	    shield.style.left = "0px";  
	    shield.style.top = "0px";  
	    shield.style.width =  winSize.pageWidth+"px";  
	    shield.style.height = document.body.scrollHeight+"px";  
	    shield.style.background = "rgba(51,51,51,0.6)";  
	    shield.style.textAlign = "center";  
	    shield.style.zIndex = "10000";  
	    shield.style.filter = "alpha(opacity=0)";  
	    var alertFram = document.createElement("DIV");  
	    alertFram.id="alertFram";  
	    alertFram.style.position = "fixed";  
	    alertFram.style.left = "25%";  
	    alertFram.style.top = "30%"; 
	    alertFram.style.width =  w;  
	    alertFram.style.height = h;  
	    alertFram.style.background = "#ccc";  
	    alertFram.style.textAlign = "center";  
	    alertFram.style.lineHeight = "150px";  
	    alertFram.style.zIndex = "10001";  
	    strHtml = "<ul style=\"list-style:none;margin:0px;padding:0px;width:100%\">\n";  
	    strHtml += " <li style=\"background:#fff;text-align:left;padding-left:10px;font-size:14px;height:25px;line-height:25px;border-bottom:1px solid #ff6a01;\">[系统提示]</li>\n";  
	    strHtml += " <li style=\"background:#fff;text-align:center;\">"+txt+"</li>\n";  
	    strHtml += " <li style=\"background:#fff;text-align:center;font-weight:bold;height:28px;line-height:28px; border-top:1px solid #ff6a01;\">" +
	    		"<input style=\"background:#fff;color:#000;font-size:14px;height:27px;line-height:27px;\" type=\"button\" value=\""+s+"\" onclick=\""+func+"\" />&nbsp;&nbsp;&nbsp;&nbsp;" +
	    		"<input style=\"background:#fff;color:#000;font-size:14px;height:27px;line-height:27px;\" type=\"button\" value=\"关闭\" onclick=\"doOk()\" /></li>\n";  
	    strHtml += "</ul>\n";  
	    alertFram.innerHTML = strHtml;  
	    document.body.appendChild(alertFram);  
	    document.body.appendChild(shield);  
	    var c = 0;  
	    this.doAlpha = function(){  
	        if (c++ > 20){clearInterval(ad);return 0;}  
	        shield.style.filter = "alpha(opacity="+c+");";  
	    }  
	    var ad = setInterval("doAlpha()",5);  
	    this.doOk = function(){  
	        alertFram.style.display = "none";  
	        shield.style.display = "none";  
	    }  
	    alertFram.focus();  
	    document.body.onselectstart = function(){return false;};  
	   }
